package demo1;

class Shape {

    public void draw() {
        System.out.println("画图形");
    }

}
class Cycle extends Shape {
    @Override
    public void draw() {
        System.out.println("⚪");
    }
}
class Rect extends Shape {
    @Override
    public void draw() {
        System.out.println("◇");
    }
}
public class Test {
    public static void drawMap(Shape shape) {
        shape.draw();
    }
    public static void main(String[] args) {
        drawMap(new Cycle());
        drawMap(new Rect());
    }
}
